A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2016 · Q381 Mark
Chlorine atoms in the upper atmosphere cause the breakdown of ozone. Cl + O₃ → O₂ + ClO ClO + O → Cl + O₂ Which statements are correct when referring to these chlorine atoms? 1 The chlorine atoms act as catalysts. 2 The chlorine atoms are free radicals. 3 The chlorine atoms are formed by heterolytic fission of a covalent bond in chlorofluorocarbons.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
B: 1 and 2 only are correct
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